Torque machine screws

TM 9- 2920- 224- 34&P

ASSEMBLY OF THE GENERATOR - CONTINUED

0010 00

n. Apply a coating of sealant about 1/8 inch thick to mounting surface of fan housing (12). Avoid covering any

tapped holes in this surface.

o. Before sealant sets, bring adapter (28) close to fan housing (12) mounting surface and start eight machine

screws (29) with flat washers (30) so that sealant will not be forced into tapped holes.

p. Torque machine screws (29) alternately and evenly to 16--25 lb--in (1.8 to 2.8 Nm), allowing sealant to be

extruded from between fan housing (12) and adapter (28). Wipe excess sealant from outside surfaces of fan

housing and adapter.

q. Apply sealant to seal opening (31) where fan motor leads enter grommet (3).

Install four pieces of nonelectrical wire (32) to tie machine screws (29) in pairs.

Install woodruff key (33) into slot in fan motor shaft (34).

Align keyway (35) in bore of fan impeller (36) with woodruff key (33) and install impeller (36) on fan motor

shaft (34).

u. Install flat washer (37) and new hexagon self--locking nut (38).

CAUTION

Make sure screwdriver is inclined so that it contacts surface

of impeller fan blade rather than edge as a safety measure

against breaking the blade while nut is being tightened.

Insert a screwdriver (39) between blades of fan impeller (36) far enough to anchor against air flow guide of

fan housing (12). Hold fan impeller (36) against rotation while nut (38) is torqued to 140 to 150 Ib--in (15.8 to

17.0 Nm).

w. Coat new preformed packing (40) with grease and install in ring groove (41) at end of fan housing (12).

0010 00- 9